After the InstancedMesh instance changes its position once, why can’t the ray hit it again?

Questions
1

Demo
The above is the demo address.

InstancedMesh, if after modifying the matrix of the instance once, it is not selected again, is there something wrong with my usage?

2

Your instancedMesh is set up with 1 element, but you are writing 10 random element matrices to it. If I set the count on the instanceMatrix to 10, then it sorta works but… there is probably still some other issue… some boxes cant be clicked until you rotate the camera a certain way.

3

The number of matrices should not matter much, right?

4

in line 18

const instancedMesh = new THREE.InstancedMesh(box, material, 10)

in line 124

return matrix.compose(position.clone(), quaternion.clone(), scale.clone());
5

I see, this setting is OK for the time being.
When the number is less than 3, if you click a few more times, the same problem will occur.

This is the updated demo

6

It seems like matrix not update after change
in line 96

    intersects[0].object.instanceMatrix.needsUpdate = true
    instancedMesh.matrixWorldNeedsUpdate = true
1 Like
7

Sometimes it still doesn’t work . bug when I change the camera position , it works

8

I tried adding the above code, but the same problem still occurs

9

It feels like the matrix of Instancedmesh has not been updated in time.